Carburetor



G.A.EYNON CARBURETOR Filed March 14, 1925 2 Sheets-Sheet tion of bore 23 which communicates with the.

air inlet opening between choke valve 5 and' the air valve 7, is provided with a plug 25 having a restricted passage '26 therethrough so as to limit the vohune of air passing through bore 23 to the fuel 17. The restriction in the bore 23 as shown at 26 controls the supply of liquid fuel through the bore 23 when the choke valve is closed and also controls the amount of air that is delivered to the bore 16 when the choke valve is open and the engine is running under nor mal operating conditions. This restriction is of a size to admit sutlicient air to comb teract. the etl'ect of the excess amount of liquid fuel delivered througlr the nozzle 17 and has the effect of properly proportioning' the liquid fuel and air in order to give the proper mixture for normal operating conditions.

The downwardly projecting stem of the main casting 1 is surrounded by a float 2!) and a fuel bowl 30, the latter having comn'iunication with bore 16 through an aperture ill in the side wall of the stem 15. lhe float is adapted to operate a float chamber inlet needle valve 32 to automatically regulate the supply of fuel to the float chamber in the ordinary manner and a detailed description of this mechanism and the operation thereof is deemed unnecessary. A drain plan" is threaded into the lower end of stem 10 and serves to retain the bowl in position and. also to attord a convenientnieans for draining fuel from the bowl as occasion demands.

In operation, the choke valve 5 is closed and the motor is rotated in the usual inanner. This creates a suction in the intake manifold, carburetor outlet opening 4, mixing chan'iber 3 and air inlet opening 2. 'lhe air inlet opening being substantially shut off to the atmosphere by valve 5 causes fuel to be sucked through the conduit formed by the bore 16 and discharge outlet 18, and also through bore 23 and discharge outlet 26. A small amount of air will be admitted through the slotted opening 6 in the choke valve 5 which will be of sullicient volumeW slightly atomize the raw fuel drawn into the engine cylinders and thus greatly facili tate starting of the motor. As soon as the motorstarts, the choke valve is opened and aSSUDlQS a horizonal position as'shown in Fig.1 The inrushing air through inlet opening 2 deflects air valve 7 in a counterclockwise direction as viewed in Fig. 1, which permits a predetermined volume of air to pass thtough the mixing chamber 3 and outlet 4. A portion of the air will also pass through opening 26 and bore 23 to bore 1'6 at a pointbelow the'top of the fuel nozzle 1?. The air so admitted will serve to atomize the fuel ejected from the nozzle 17 and.

hence a rich volatilizedimixture will emit mounted within the air inlet oncnin I L m Irom opening 18 into the mixing chamber 3 which will be further admixed with the a forcntcntioned volume of air passing therethrough to form an explosive mixture of the correct propm'tion. Due to the fact that the fuel is atomized when it emits from opening la, a thoroughly atomized mixture will be insured in the mixing chamber 3 before it passes to the intake manifold and en ine cylinders. The volume of preatomized n ixture emitting from opening 18 may be cbntrolled by adjusting the valve 20 toward or from its seat 15). The main volume of air passing through mixing chamber 3 is automatically governed by means of the .weighted air valve T, the size of the venturi, and is also dependent upon the extent the throttle valve ll is opened.

Attention is also called to the fact that the fuel nozzle 17 is normally below the fuel level in the floatchamber. such level being indicated by the dot-and-dash line A-A in Fig. 1. It is thus apparent that fuel normally occupies a portion of the bore 23. \Vhen the motor is idling, there will be a relatively small volume of air passing through inlet opening 2 and bore 23 and hence a particularly rich mixture will be emitted from opening 18 into the main air supply passing through mixing chamber 3. Under these conditions the idling mixture as a whole is enriched which is desirable in order to prevent stalling of the motor when a load is applied thereto or when running idle. As the throttle valve 11 is opened to accelerate the motor, the aforementioned rich idling mixture will continue to emit from opening 18 for a brief period. or until the speed of the motor is sullicient to draw additional air through bore 23, and hence a rich mixture is momentarily supplied through opening 18 which highly desirable for purposes of accelerating. As the engine speed increases due to such acceleration, a larger volume of air will be supplied through bore 2 3 and hence cause leaner mixture of fuel and air to be discharged through opening 18 into the main air supply passin,r through the mixing chamber 3. It is thus apparent that the mixture as a whole will be automatically thinned out as the engine speed increases which permits economy of operation to be effected.

In Figs. 3 and 4 I have shown my invention applied to a vertical or top outlettype of carburetor. In these views 4t) denotes the air inlet of the carburetor, all the m xing chamber thereof which is formed by means ot a venturi 42, and -13 ocnotes the outlet passage. A choke valve at is nivoially it) and a throttle valve to is similarly mounted in the outlet passage 43. In this type of carburetor the float chamber to and associated mechanism is located to one side n? the, i

cussing The neeclie end osso-oiaied mechanism we of stoncisi'ci construction usually found in this type of tiil'bfli'8t01 a deioiied descripcion thereof is deemed unnecessary Fuel is admitted 46 i-iii'ougb a passugwa a 49 which is disposed Witif vei zicei bore 50 formed in i110 main costing 47. The upper end of bor is provided, with restriciged eperiui'e and o valve 52 cooperates with said 21PE*""H8 to vary the amount of fuel or vopoiu mixture. (as will be ere pioined. iiereiuuitei which is admitted to a horizontal bore 53 conducts such mixtureto theinixing chamber A ei'ticoily disposed bore 5i extends upwardly from bore 53 and the upper end 01 this bore coul- Inunicates with a iioiizontuiiy disposed bore 55 which comnmnicnies flii'ougii a restricied opening 56 wiih ti outlet passage 5;?-

a point adjacent the iiorinoiiy closed posiiion of the throttle who A valve 57 cooperates with the restricted passage 56 to limit the opening ih'ereof and hence form a iow speed adjustment $01: the carburetor, in applying my inv ion "i0 a carburetor of this type, I provicie abore 55) in body portion of he casting 4E, and this bore preferably communicates at one end with the mixing chamber a point below bore and above the normal iuei 'Lvei in the float chamber which is indie" iine by the B--B. The opposite end' of bore 59 (20111- municet-es with bore 50 at :1, point beiow the to of the fuei jet 44%.

:1 operation, the choke valve 44 is closed and the motor rotated to sense foe to be drawn from the float ciiuznbei' through passage 4-8, jet 49, restricted Elond bore 53 $0 the mixing chsmbciz Fuel wiil also be drawn from jot 49 through bore 59 to the mixing chamber and hence a particulariy rich mixture will be supplied to the motor for purposes of starting After the motor has been started, the choke vsive is opened to the position shown in Fig 3, and air is now drawn through boi'e 59 and thence upwa 'ciiy through bore 50: The air thus entering bore 59 sciinixes with the "fuel withdrawn from jet i9 and hence the atomized mixture is drown through resiricieci opening 51 and through bore 53 to the mix ing chamber as has been previousiy plained in connection with the type of carbui'etor shown in Figs. 1 and 2.

v The carburetor shown in Figs. 3 and will perate in subs'iuntiaiiy the some msnner disclosed in connection with the horizontal or side outii, type of carburetor are copi; that for purposes of idling the atomized mixture in the veiiosi type of carburetor will be drawn upws dip through boys 54 and discharged throw: 1 restricted edge 56 to the oarbureior ouiiiet posse iiiih e carburetor ciuisi'sructeci in scooi'cisnco with my inveniion, ii; 'wiii be apparent skim: the PJiX'iUTE adjusting valve 21 in "the i oi coirbureiorc or in the case of ihe vertical type of ourinoy be adjusted the best posinormal running o iiiitions. i /hen K Le moi-(u: is started and bile choke valve closed, fuel will be ad. i't'ieci in the usual manner and also though the bore which ci'uinnunieaies with the air inlet passage and ihe jet bore so as to supply on additional amount of fuei with h ii ii; desirable for starting. After the motor has siaitexi, o, voiatii 1 HliXtl'iIG of air and. fuel will be zidinitte A from the jet and this mixture will ed with the main volume/of oii: rough the BlbULGCOl'. when the inn: reioiveiy rich inixiure will Jed the engine cylinders/end such "use wiii be our led :nomenioeiiy when the engine is accei 'a'ied, although the mixture will be uu'iOnmticuZIy thinned out flue engine speed. i1 4 These eon- {iitions highly Lie uoi Q01 the operation of an interns oombu on engine in an euioinobiie wiiero the spee varied rapidly to meet or so conditions.

I have found by experiment thot neuter economy end better engine per- 1. nuance may be obioinm; by vsi'yingthe volume of voiatilized foei mixture which is admixed with the volume of air, than could be obtained by the ordinary method of varying the amount of fuel which is ad- .uiixed wiih h voiunie of sin The po. eperizui'e 12 in ihrotcc Vi iVi-ll 's to prevonfi; any oonciensstion the intake manifoici from pilsition iihis point on the engine of the throttle during idling of iiie QIIgIL-Q. be aperture .12 provides a l i 55 between the throttle and dis utiei WHHS t an orfinoeiiy obin idling posisuch operir e units suiiicient ibis point to prevent the sforepiling up of the condensation Havin thus described in veniion, whet it eiuiin booiy pori and on air i said chamber, :1 nozquid fuel, s conduit surrounciing ole and extending ii Jrefrom tosing a re it may disof the engine is i municating at, one end with the said conduit and at its other end with the said duct on the atmosphere.side ot' the air valve, and a needle valve adpnstably controlling the delivery of fuel and air from the said outlet to the mixing chamber.

in a carburetor of the class described comprising a body portion, an air inlet, a mixing chamber and a mixture discharge outlet, a choke valve in said air inlet, a constant level fuel supply chamber, a bore 0011119 ng said fuel supply chamber with said mixing chamber, a fuel discharge nozzle positioned within said bore and below the normal level of fuel therein and adapted to deliver fuel in excess of the normal requirements, a conduit connected at one end with said bore and at the opposite end with said air inlet on the suction side of said choke valve, said conduit having a restriction therein whereby to limit the supply of air to said bore when said choke valve is open, said conduit also serving as an additional fuel supply to said mixing chamber when said choke valve is closed, said bore having a needle valve adjacent the delivery end thereof for controlling the volume of mixture delivered to said mixing chamber through said bore.

3. A carburetor of the class described c0mprising a body portion having an air inlet, a mixing chamber, and a mixture discharge outlet, a choke valve in said air inlet having a slotted opening therein, an air valve in said air inlet adapted to permit the passage of air at all times to said mixing chamber, a fuel supply chamber and a conduit connecting said fuel supply chamber and mixing chamber, a restricted passageway communieating with said conduit at one end and at the opposite end with said air inlet on the engine side of said choke valve.

1. A carburetor com missing a body portion having a mixing chamber, an air supply duct having a choke valve therein and a mixture discharge outlet, a nozzle for liquid fuel, a conduit surrounding said nozzle and extending therefrom toward said mixing chamber, there being a restricted outlet by which said conduit may discharge into said mixing chamber, an air valve in said air supply duct adapted to permit the passage of air at all times to said mixing chamber, a restricted passage communicating at one end with said conduit and at the other end with said duct on the engine side of the choke valve whereby said passage will serve to convey fuel to said mixing valve is closed and will serve as an air sup= ply to said conduit when said choke valve is open and a needle valve adjustably controlling the delivery of fuel and air mixture from said conduit into hc mixing chamber.

in testimony whereof, I hereunto atlix my signature.

GEORGE A. EYNOX.

chamber when said choke/-- 

